Just like August's post, here's a graph of what versions of Firefox people use Greasemonkey with.
You can open the spreadsheet for the raw data and a larger graph.
Takeaways seem to be not a lot has changed, besides some up-and-down for each rapid release version since then (6 came and went, with 7 replacing it). Firefox 3.6 users are still just shy of three quarters of a million. Firefox versions too old for the newest version of Greasemonkey are still hanging in at almost a quarter million, and just shy of 50,000 users are running a too-new version of Firefox, probably with Add-on Compatibility Reporter.